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Finding the Fourth Proportional to 3,906.62, 5,389.57 and 2,489.93

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Solution

The fourth proportional to 3,906.62, 5,389.57 and 2,489.93 is: 3,435.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,906.62 : 5,389.57 = 2,489.93 : x
  2. Step 2: Convert to fraction form
    3,906.62/5,389.57 = 2,489.93/x
  3. Step 3: Cross multiply
    3,906.62x = 5,389.57 × 2,489.93
  4. Step 4: Simplify right side
    3,906.62x = 13,419,652.03
  5. Step 5: Solve for x
    x = 13,419,652.03/3,906.62
  6. Step 6: Final answer
    x = 3,435.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.